public class Jsrc10
{
    public static void main(String[] args)
    {
        byte b = 9;
        short s = b;
        int i = s;
        long l = i;
        float f = l;
        double d = f;
        System.out.println(d);

        // 强转
        // Type1 id1 = (Type2)id2;

    }
}